<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		<script>
			var str='Abc123vnn244';
			var reg=/abc/;
			var reg2=/abc/i;
			console.log(reg.exec(str));
			console.log(reg.exec(str));                                                                       
		</script>
	</body>
</html>
